That is an LTA, though it would help to see the oral disc, it does not attach directly to rock. You need MH and you need to feed it, chunks of fish, silversides worked for me.
Your sandbed looks like a crush coral bed, LTA's prefer/need muddy-sandy bottoms to bury their foot, it is highly unlikely it will eat anything until it is settled.
The color looks decent, the darker the better, so it might hold on for a little while, but who knows how long, you might consider returning it before it dies.